It's funny but the characters except Hino, the protagonist, isn't fleshed out. Sure, Hino is a gay who went for an all boys school to find love then he meets his type in the house he was made to live in. He meets Aki (his type), Haru (the mischievous brother), and the delinquent who had the gap moe and became Hino's friend.
First, Aki is made to be this perfect character. He had his moments, like blushing or recognizing his sudden feelings, but he seemed off... And then Haru had his spotlight of teasing!/seducing Hino but doesn't appear after all that. Like... He was just there for Hino to say that it's Aki he likes and that's it. Then the delinquent friend was just there for him to study for Aki...
In the end, even Aki seems to be just a prop for Hino to make his fantasies a reality. (like, everyone were just props instead of individual characters interacting with Hino)
High School Lala Love